MODERN PHYSICS LETTERS B
·
2024
·
IF 1.8
Li Liu,Qifu Bao,Tiangui Zhao,Kun Liu,Detai Shi,Siyu Li,Wei Zhu,Xiaolong Li,Jianer Zhou
A series of Zn 1 − x Fe x O ( x = 0 , 0.015, 0.045, 0.075) nanoparticles were synthesized using the solution co-precipitation method, and their structural and property characteristics were investigated. X-ray diffraction (XRD) analysis revealed that all Zn 1 − x Fe x O samples exhibited a hexagonal wurtzite crystal structure with the P63mc space group. The introduction of Fe doping led to a slight lattice distortion in the samples. The morphology of the nanoparticles, including polydispersion and agglomeration, as well as the presence of the second phase ZnFe 2 O 4 , was examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). UV–Vis diffuse reflectance spectroscopy demonstrated that the band gap of Zn 1 − x Fe x O lies between 3.152 and 3.163 eV. With the increase in Fe ion doping, the band gap shows a slight decreasing trend. Mössbauer spectroscopy revealed that iron ions in the nanoparticles existed in a trivalent state and exhibited two different configurations: One involved iron replacing zinc without creating a vacancy, while the other involved iron substituting zinc with a vacancy. The ferromagnetic nature of the Fe-doped samples can be attributed to the exchange interaction between two Fe 3 + ions mediated by the F-center mechanism.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2020
·
IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 5
·5155-5167
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IF 2.914
Zhu Ying,Liu Kun,Muhammad Yaseen,Zhang Hanbing,Tong Zhangfa,Yu Binbin,Sahibzada Maria
To reveal the characteristics of tetracycline (TC) photocatalytic degradation under Cu(II) coexistence, effects of Cu(II) on TC photocatalytic degradation by ZnO nanoparticles (ZnO NPs) as a function of pH, humic acid (HA), and initial Cu(II) concentration were investigated. Interaction of TC with Cu(II) in the treatment process was analyzed by circular dichroism (CD) spectroscopy, while TC degradation pathway was investigated by high - performance liquid chromatography-mass spectrometry. Sixty-five percent and ninety-one percent TC degradation within 60 min in the absence and presence of Cu(II), respectively, was reported. Both adsorption and photocatalytic degradation of TC under Cu(II) coexistence increased with increasing pH from 3 to 6, while decreased with further increase in pH. HA inhibited the degradation of TC by ZnO NPs both in the presence as well absence of Cu(II), while TC degradation decreased from 91 to 73% and from 73 to 37% in the presence and absence of Cu(II), respectively. TC degradation by ZnO NPs first increased then decreased with increasing Cu(II). Maximum TC degradation (about 94 % ) was obtained in the optimum concentration range of Cu(II) (0.05–0.15 mmol/L). In addition, there was a lag effect between TC adsorption and degradation on ZnO NPs. TC degradation was improved via Cu(II)–TC surface complexation and followed N-demethylation and hydroxylation routes. This study could be of potential importance in extrapolating the transformation of TC or other antibiotics under the coexistence of heavy metals in water.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2015
·Vol. 74
·期 3
·718-725
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IF 1.532
Huang Wenyi,Bai Dawei,Li Lijun,Wei Huidan,Shi Zhipeng,Cheng Hao,Li Yanqing
Abstract We reported here an improved method in ethanol producing controllable ultrasmall ZnO@PEG nanoparticles in large-scale. The growth process for bare ZnO and ultrasmall ZnO@PEG nanoparticles were monitored by the UV–Visible spectrum and the result of particles size distributions was coincident with other measurement techniques [dynamic light scattering and transmission electron microscopy (TEM)]. Comparing with the result of FT-IR, TGA characterization, PEG could be adsorbed at the surface of ZnO nanoparticles. The fourier transform analysis from the TEM images indicated that PEG coated at the surface of ZnO nanoparticles did not have a direct effect on the morphology of the nanoparticles grown within. As the same growth time and excitation wavelength, the ZnO@PEG nanoparticles were endowed with higher FL intensity than bare ZnO nanoparticles from the fluorescence characterization. The FL intensity could retain 91.0 % of its beginning intensity for 6 days in ethanol, which declared the ZnO@PEG had acceptable storage stability. When the ZnO@PEG nanoparticles were transferred to aqueous solution, a balance value was found for the FL intensity in 120 min. Interestingly, the colloidal solution can keep transparent for 6 months without aggregation at room temperature. The controllable ultrasmall ZnO nanoparticles may link molecular-scale materials forming larger dimensions nanomaterials with different physical and chemical properties. And more, this fast and simple method for preparing ultrasmall ZnO nanoparticles ethanol solution can be improved for further study about doped ZnO for functional coating and solvent. Graphical Abstract
研究领域:
材料科学
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化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Bing Song,Lixue Qi,Hongyi Wu,Yan Tong,Li Li,Muhammad Ikram,Keying Shi
The solvothermal and wet chemical method was developed to synthesized the p-n heterostructures of the thin porous Co 3 O 4 nanosheets with ZnO nanoparticles. The resulting products were analyzed by using various characterization techniques. The results possessed that the presence of a large number of oxygen defects on the surface of Co 3 O 4 -ZnO-7 favors enhancing the NO 2 adsorption. Correspondingly, the formation of p-n heterojunction and the large surface area of the material itself increased the carrier density and exposed more active sites, which collectively boost the sensing performance to NO 2 . The sensor showed a high response of 45.7 (S = R a /R g ) to 100 ppm NO 2 at room temperature (RT = 25 °C), with a short response/recovery time (1.3/25 s), and the lower detection limit of the sensor reached 30 ppb, with good selectivity, reproducibility and stability. This study will offer the opportunity to develop new sensors with high response and fast response-recovery to NO 2 at room temperature.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Jia,Rong-Kun Liu,Qian Sun,Jie-Xin Wang
ZnO nanoparticles with high safety and stability are often used as active ingredients in sunscreens to protect the skin from ultraviolet rays. However, ZnO nanoparticles are easy to agglomerate, which will significantly affect the ultraviolet absorption and bacteriostatic properties, and the reactive oxygen species induced by the photocatalytic activity may result in irreversible secondary damage to the skin. Herein, the ZnO nanoparticles are dispersed uniformly on the surface of latex particles, and these composite particles are used as shell materials to construct self-assembled colloidosomes by high-gravity technology, which can improve the application properties with synergistic enrichment of the hollow structure. The ultraviolet resistance of colloidosomes is significantly higher than that of the pure ZnO nanoparticles. The higher the loading capacity, the more obvious the inhibition effect of colloidosomes on the growth of Gram bacteria. Furthermore, the antioxidant anthocyanin is in situ encapsulated in colloidosomes, and at a concentration of 2 g/L, the high free radical scavenging rate of 78% can be achieved. The construction of multifunctional colloidosomes provides a route for sunscreen and cosmetics applications.
研究领域:
材料科学
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生物学
·
化妆品科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Shutong Pang,Hualiang An,Guirong Wang,Xinqiang Zhao,Yanji Wang
Methylcyclohexyl-2,4-diisocyanate (HTDI) is an upgraded product of toluene-2,4-diisocyanate. HTDI-derived polyurethane products show excellent properties such as nonyellowing degeneration, light stability, and weather resistance. The cleavage of dimethyl methylcyclohexyl-2,4-dicarbamate (HTDC) is a crucial step for phosgene-free synthesis of HTDI. In this work, the catalytic performance of ZnO nanoparticles (NPs) with different particle sizes was evaluated for the cleavage of HTDC, and the result showed that the selectivity of HTDI up to 81.3% was achieved with a 94.2% conversion of HTDC over a 19.1 nm ZnO catalyst. It was found from the results of experiments and characterizations that the decrease in ZnO NPs particle size led to the following circumstances: (1) the specific surface area increased, (2) the crystal preferred orientation shifted from the (100) plane to the (002) plane, and (3) the oxygen vacancy concentration increased. The first-principles calculation results showed that two electrons left from the formation of an oxygen vacancy on the ZnO surface could transfer to the neighboring Zn site. Thus, the electron-withdrawing ability of the Zn site is changed and the structure of the ZnO surface is rearranged, which facilitates the inhibition of side reactions. Therefore, changing the concentration of oxygen vacancies and then adjusting the electron-withdrawing ability of Zn sites on the ZnO surface are an effective way to achieve highly selective synthesis of HTDI by the cleavage of HTDC.
研究领域:
催化
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材料科学
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化学工程
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DOI
高影响因子
NANOTECHNOLOGY
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2020
·Vol. 31
·期 28
·285402
·
IF 3.551
X T Zhang,Y F Yuan,M Zhu,G C Cai,Z W Tong,Z Y Yang
Low electronic conductivity and large volume variation result in inferior lithium storage performance of ZnO. To overcome these shortcomings of ZnO, herein ZnO nanoparticles are encapsulated in resorcinol–formaldehyde resin-derived hard carbon and then further assembled into a 3-dimensional mesoporous framework structure using a polyvinyl pyrrolidone-derived soft carbon network. The synthesis methods include the polymerization of resorcinol–formaldehyde resin and a polyvinyl pyrrolidone-boiling method. ZnO@dual carbon has af large specific surface area (153.7 m2 g−1) and high porosity. It exhibits excellent cycling performance and high rate capability. After 350 cycles at 500 mA g−1, the ZnO@dual carbon still delivers a discharge capacity of 701 mAh g−1 while the actual discharge capacity of ZnO reaches 950.9 mAh g−1. At 2 A g−1, ZnO@dual carbon delivers the average discharge capacity of 469.6 mAh g−1. The electrochemical performance of ZnO@dual carbon is remarkably superior to those of ZnO@single carbon, pure carbon and pure ZnO nanoparticles, demonstrating the superiority of the dual carbon-assembly structure. This composite structure greatly improves the structural stability of ZnO, enhances its electron conductivity and overall electron transport capacity; which facilitates electrolyte penetration and Li ion diffusion, leading to improved cycling stability and good rate capability.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 30
·11418-11423
·
IF 5.101
Lei Meng,Liaoying Zheng,Lihong Cheng,Guorong Li,Lizhu Huang,Yan Gu,Fuping Zhang
A novel varistor-composite synthesis for the fabrication of high breakdown voltage ZnO varistors has been successfully developed. It involves coating ZnO nanoparticles with SiO2 through the hydrolysis of tetraethyl orthosilicate (TEOS) and the subsequent coating of additives on the core of the SiO2-coated ZnO particles, producing a double core-shell structure. The effect of the amount of TEOS used on the morphology of the synthesized composites and the microstructure, as well as the electrical property of the sintered samples from the double core-shell composites are fully studied. Such materials, with the appropriate amount of TEOS added (Si4+/Zn2+ = 0.15 moles) enables the superior electrical performance of ZnO varistors: high breakdown voltage (VB = 1123 V mm−1), excellent nonlinear coefficient (α = 42.5) and low leakage current (IL = 8.5 μA), compared with current commercial varistors and the sample from single core-shell composites. The high performance is attributed to the smaller ZnO grain size and perfect additive homogeneity. The SiO2-coating provides a better way to control the varistor microstructure through the formation of a nearly circular distribution of blocky Zn2SiO4 around the ZnO grains.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
Journal of Soil Science and Plant Nutrition
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2024
·Vol. 24
·期 1
·1301-1317
·
IF 3.4
Mai Yiming,Ren Yong,Deng Siying,Ashraf Umair,Tang Xiangru,Duan Meiyang,Mo Zhaowen
Foliar application of ZnO Nanoparticles (ZnO-NPs) could reduce adverse effects of multiple abiotic stresses in crop plants. The present study was conducted to induce the low temperature stress tolerance in growing rice plants by the foliar application of ZnO-NPs. Two fragrant rice cultivars i.e., Meixiangzhan2 and Xiangyaxiangzhan were grown under normal temperature (NT, day/night: 28℃/25℃) and low temperature (LT, day/night: 15℃/12℃) after foliar application of Zn and ZnO-NPs with following treatments viz . , application of distilled water only (CK), ZnSO 4 ·7H 2 O at 6.6 mg·L −1 (CK1), and application of ZnO-NPs at 25, 50, 100, and 200 mg·L −1 regarded as N25, N50, N100, and N200, respectively. The growth and physiological attributes were examined to assess the potential of ZnO-NPs to induce low temperature stress tolerance in growing rice plants. The ZnO-NPs, and temperature × ZnO-NPs had a significant effect on the growth and physiological attributes ( p < 0.05) of rice seedlings. The ZnO-NPs application enhanced the root dry weight, root-shoot ratio, total dry weight, and chlorophyll a/b ratio in Xiangyaxiangzhan by 10.48%-18.10%, 1.96%-20.31%, 3.25%-6.02%, and 3.70%-6.11% at low temperature, respectively. The activity of antioxidant enzymes in Meixiangzhan 2 was increased, whilst the malondialdehyde (MDA) content in root was significantly declined. Moreover, lower levels of ZnO-NPs treatment regulated the activity of N-metabolizing enzymes i.e., nitrate reductase (NR), glutamate synthase (GS), glutamine oxoglutarate aminotransferase (GOGAT) and in seedlings under low temperature. Regarding correlation analysis, the N100 and N200 treatment exhibited a stronger correlation with growth-related attributes, compared to other treatments. Foliar application of ZnO-NPs at appropriate concentration (100 mg·L −1 ) could alleviate the inhibitory effect of low temperature stress on the early growth of fragrant rice.
研究领域:
植物科学
·
纳米技术
·
农业逆境管理
✓ 已验证
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Dong-Dong Zhang,Si Hu,Qiong Wu,Jin-Feng Zhao,Ke-Rui Su,Li-Qin Tan,Xian-Qing Zhou
Zea mays (Maize) is prone to mildew due to its rich nutrition and large embryo, resulting in the decline of edible quality, germination rate and even threatening people's health. In this study, ZnO nanoparticles were prepared by hydrothermal method to inhibit the growth of microorganisms on the surface of Zea mays . For its safe and efficient application, mesoporous silica (mSiO 2 ) was modified on its surface and successfully prepared ZnO@mSiO 2 Nanocomposites. The ZnO@mSiO 2 nanocomposites were successfully prepared and characterized by TEM, EDS, XRD, FT-IR, and it could significantly inhibit two model bacteria and three model fungi. After mixing with Zea mays and 42 days of simulated storage, they could significantly inhibit the growth of microorganisms in Zea mays , ensure the stability of Zea mays quality and improve the germination rate of Zea mays . The ZnO@mSiO 2 nanocomposites prepared in this study provide a new idea for the safe storage of Zea mays .
研究领域:
食品科学
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材料科学
·
植物保护
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yiqun Zhang,Chong Wang,Fengmin Liu,Xiaoying Sun,Xinhao Guo,Lianjing Zhao,Geyu Lu
In recent years, researchers have discovered that self-assembled monolayer functionalized surfaces could improve the gas-sensing performance of semiconductor oxide-based sensors. In the present work, metal-organic framework material ZIF-8 was selected as the self-sacrificial template, and then ZIF-8 materials were calcined at a high temperature to obtain ZnO nanoparticles . Subsequently, the surface of ZnO was modified to install a single layer of 3-aminopropyltriethoxysilane (APTES). In comparison with the pure ZnO-based sensor, the sensor based on 0.5 vol% APTES/ZnO had higher response to 2-butanone. The response has remarkably improved mainly due to APTES molecules capture electrons from the surface of ZnO to widen the electron depletion layer . In addition, the amine (–NH 2 ) group of the APTES monolayer enhanced the specific interaction between the sensing material and 2-butanone, thereby the performance of the sensor was improved. After functionalization with 0.5 vol% APTES, the lower detection limit of the sensor reached as low as 200 ppb, while that of the pure ZnO-based sensor was 500 ppb.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）